Glass Foams Prepared by Porous Microspheres Foaming Method and the Sintering Process Research
QU Yanan1, XIE Yongjiang1, ZHONG Xinhua1, YANG Jinlong2,*
1 Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China 2 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Abstract: Porous microspheres were prepared using waste glass powder as the main raw material, and glass foams with high porosity were prepared by the porous microspheres foaming method. The influence of sintering temperature, heating rate and holding time on the porous structure of glass foams was investigated. The optimum sintering parameters for the preparation of glass foams from porous microspheres were proposed. The results show that glass foams with high porosity can be prepared when the D50 of the glass powder is ground to be about 4 μm. With the increasing of the sintering temperature, the cell size and the porosity increase. With the heating rate increasing in a reasonable range, the porosity increases, and the volumetric water absorption reduces. With the increasing of holding time, the water volumetric absorption and the crystal percentage increase. The main crystalline phases are quartz(SiO2), tridymite(SiO2) and devitrite (Na2Ca3Si6O16). The optimum sintering temperature, heating rate and holding time are 700—750 ℃, 3—5 ℃/min and 1—2 h, respectively. The obtained glass foams with high compressive strength of 0.8—2.9 MPa can be used as building thermal insulation materials.
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2023, Vol. 37 
